package com.abc.scholarship.config.security.hanlder;



import com.abc.scholarship.config.security.redis.RedisService;
import com.abc.scholarship.config.security.utils.JwtUtils;
import com.abc.scholarship.config.security.utils.LoginResult;
import com.abc.scholarship.domain.entity.User;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SerializerFeature;

import io.jsonwebtoken.Jwts;
import org.springframework.security.core.Authentication;
import org.springframework.security.web.authentication.AuthenticationSuccessHandler;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.nio.charset.StandardCharsets;

@Component
public class LoginSuccessHandler implements AuthenticationSuccessHandler {

    @Resource
    private JwtUtils jwtUtils;

    @Resource
    private RedisService redisService;

    @Override
    public void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response, Authentication authentication) throws IOException, ServletException {
        // 设置客户端响应的内容类型
        response.setContentType("application/json;charset=UTF-8");
        // 获取登录用户信息
        User user = (User) authentication.getPrincipal();

        // 生成 token
        String token = jwtUtils.generateToken(user);
        // 设置token 签名密钥 和 过期时间
        long expireTime = Jwts.parser() // 获取 DefaultJwtParser对象
                .setSigningKey(jwtUtils.getSecret()) // 设置签名密钥
                .parseClaimsJws(token.replace("jwt_",""))
                .getBody().getExpiration().getTime(); // 获取token过期时间

        // 创建登录结果对象
        LoginResult loginResult = new LoginResult(user.getId(), 200,token,expireTime);


        // 消除循环引用
        String result = JSON.toJSONString(loginResult, SerializerFeature.DisableCircularReferenceDetect);
        // 获取输出流
        ServletOutputStream outputStream = response.getOutputStream();
        outputStream.write(result.getBytes(StandardCharsets.UTF_8));
        outputStream.flush();
        outputStream.close();

        /**添加的内容**/
        // 将生成的token 存到 redis
        String tokenKey = "token_" + token;
        redisService.set(tokenKey,token,jwtUtils.getExpiration()/1000);
    }
}

